Amazon Prime Air – a drone-powered delivery service – may be available sooner than you think, CEO Jeff Bezos confirmed via Twitter on Wednesday. The company will be able to deliver packages weighing up to five pounds in 30 minutes or less. Amazon is still testing a variety of drones for the service and is currently only approved to used them in daylight as long as there's no snow, rain or ice.

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The Seattle-based online retailer is still running trials in the U.S., U.K., Austria and Israel through a number of “development centers.”

When will Prime Air launch worldwide? Even Amazon's not sure.

“We will deploy when and where we have the regulatory support needed to safely realize our vision,” the company explained. “We’re excited about this technology and one day using it to deliver packages to customers around the world in 30 minutes or less.”

Though drone technology may seem like a safety hazard for commercial airplanes or air ambulance services, Amazon assured customers that it was taking extra precautions.

“Safety is our top priority. Our vehicles will be built with multiple redundancies, as well as sophisticated ‘sense and avoid’ technology. Additionally, through our private trial in the UK, we will gather data to continue improving the safety and reliability of our systems and operations,” the e-commerce site said.

Prime Air was first announced in 2013, and the current trial is being tested with just two customers. The company plans to expand its client base to hundreds of people during the next few months.